Sticky ATM keypad may be a scam to get your cash. — Brand X/Getty Images

In this (arts and) crafty con, thieves glue down certain ATM buttons — "enter," "cancel" and "clear" — to prevent you from completing a transaction after inserting a cash card and keying in a PIN. Frustrated, you leave the machine to report the problem and crooks move in to complete the withdrawal.

It works, say police, because many people don't realize that, on many ATMs, you can use the touchscreen as well as the physical buttons for the final steps of getting cash. That's how the crooks get your cash.

In machines with this feature, an on-sceen tab that says something like "press here" can be touched to complete a transaction instead of using the "enter" key.

So far, this gotcha-with-glue scheme has turned up only in California.

A similar ploy showed up last year in India. In that case, New Delhi police arrested a man who allegedly glued down keypad buttons and then used a screwdriver to release and push the stuck "enter" key while the victim walked off to report the jammed machine to bank officials.

Related

In addition to glue, other innocuous household items have been pressed into service by ATM crooks:

Napkins or plastic sheets. They're stuffed into the cash dispenser to block the release of money. From there on, the ruse is the same as with glue: When you go to seek help, thieves dislodge the block and pull out the cash.

Camera film or aluminum foil. It's slipped into the card slot to trap your card inside the machine. After you leave to get help retrieving your card, the crooks use basic tools to remove the trap and grab the card.

Stuck keypads versus skimmers

So if keypad buttons are stuck, see if you can complete your withdrawal using the touchscreen feature. If you can't, or cash doesn't dispense or your card is trapped inside after you've entered your PIN, try not to step away from the ATM. If you have a cellphone, take it out and call your bank from the ATM.

Despite low-tech tricks like these, electronic devices known as skimmers remain the go-to method for en masse ATM theft. Skimmers, which can be purchased online, are placed over the ATM's card slot to scan information encoded in the magnetic strip of debit cards.

The devices can capture data from hundreds of cards before scammers retrieve them and use the data to make duplicate debit cards. In the meantime, miniature spy cameras placed at the ATM have recorded the finger strokes of card owners entering PINs. The thieves now have all they need to make multiple cash withdrawals.